Go to the trainer for your crafting skills, there is one on the Fleet of course, and then most major cities have them. There you can buy higher level schematics. I don't know the exact spread but here's an example, if your skill in armstech is 160 and a schematic requires 100, you might not get a skill point for crafting it, but is the schematic requires 140 then you would. As you rank up your crafting skill you will unlock more and more schematics for purchase from the crafting skill trainer.

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